Frequency sharing mobile communication system equipped with diversity receiver incorporated with shared wave canceller

ABSTRACT

In a mobile communication system, FDMA/TDMA signals, CDMA signals or TD-CDMA signals have a same time-slot and one signal shares a frequency in the time-slot. The system of a time-slot sharing and a frequency sharing has diversity receivers for demodulating information of desired waves based on signals in which shared waves have already been removed at receiving of desired waves when one signal is a desired wave and there are one or more shared waves.

TECHNICAL FIELD

The present invention relates to a frequency sharing mobilecommunication system to provide a frequency sharing having one or morediversity receivers including one or more shared wave cancellers toremove shared waves.

BACKGROUND ART

In general, a mobile communication system comprises mobile communicationdevices such as vehicle telephones or portable telephones (hereinafterreferred to as mobile stations) and base stations for communicating themobile stations through radio channels, for example. In this mobilecommunication system, radio frequency spectrums in different radiocommunication methods are possibly shared (hereinafter referred to as afrequency sharing) between FDMA/TDMA method (frequency division multipleaccess/multi-carrier time division multiple access method) and CDMAmethod (code division multiple access method). In the present situation,the frequency sharing between different codes in CDMA method has beenwidely used.

In the frequency sharing mobile communication system based on FDMA/TDMAmethod and CDMA method, the CDMA signal is a shared wave when a desiredwave is the FDMA/TDMA signal. In this case, the CDMA signal is thetarget signal to be removed. In addition, the FDMA/TDMA signal is ashared wave when a desired wave is the CDMA signal. In this case, theFDMA/TDMA signal is the target signal to be removed. Furthermore, in thefrequency sharing mobile communication system based on FDMA/TDMA methodand TD-CDMA (time divided CDMA) method, the TD-CDMA signal is a sharedwave when a desired wave is the FDMA/TDMA signal. In this case, theTD-CDMA signal is the target signal to be removed. In addition, theFDMA/TDMA signal is a shared wave when a desired wave is the TD-CDMAsignal. In this case, the FDMA/TDMA signal is the target signal to beremoved. Here, TD-CDMA indicates the Time-Divided CDMA or theTime-Slotted CDMA disclosed in the United State patent U.S. Pat. No.4,799,252 invented by Eizenhoffer, and whose technique is well known inthe world.

In the prior art, although the removing method for eliminating sharedwave signals in receivers having no diversity function has beendisclosed, there is no method for removing shared wave signals inreceivers having the diversity function.

In the prior art, there is the technique disclosed in the U.S. patentnumber U.S. Pat. No. 5,363,403 as the method to remove the shared wavesignal when one CDMA signal is a desired wave signal and other CDMAsignals are shared wave signals. However, the technique of this patentdisclosed no method to eliminate transmission path distortion in aplurality of transmission paths.

In addition, the technique described in the U., patent number U.S. Pat.No. 5,511,068 disclosed an adaptive filter in a time-divided CDMA signalsystem. However, this U.S. patent disclosed no frequency sharing of theCDMA signal and the TDMA signal in one time slot. In addition, this U.S.patent disclosed no shared wave canceller to remove shared wave signals.Furthermore, it is difficult to apply the conventional techniquedisclosed in this U.S. patent when a desired wave signal is a digitalsignal based on FDMA/TDMA method and when a shared wave signal to beremoved is the TD-CDMA signal.

Furthermore, the technique described in the Japanese patent laid openpublication number JP-A6/141833 disclosed the demodulator having areverse correlation filter in which one CDMA signal in a plurality ofshared CDMA signals is used as a desired wave signal and the distortionof this CDMA signal caused in a plurality of transmission paths iscompensated. However, it is difficult to apply this conventionaltechnique to the case that the desired wave signal is the FDMA/TDMAdigital signal and the shared wave signal to be removed is the CDMAsignal. Furthermore, it is also difficult to apply this conventionaltechnique to the case that the shared wave signal to be removed is theFDMA/TDMA digital signal.

In addition, the Japanese patent laid open publication numberJP-A6/244746 disclosed the technique that a replica of the TDMA signalhaving a large signal power is made and then this TDMA replica issubtracted by the received signal in order to receive the FDMA signalhaving a small signal power. However, this patent disclosed no techniquefor CDMA signal and a time shared TDMA signal. In addition to this, thisconventional technique described no transmission path simulator tosimulate a plurality of transmission paths when replicas are made.

Furthermore, the Japanese patent laid open publication numberJP-A8/84105 disclosed the technique of different equalization methodrelated to the frequency diversity method. However, this techniquedisclosed no TD-CDMA method.

Moreover, the Japanese patent laid open publication number JP-A8/65222disclosed the technique that a distorted radio wave obtained by using anequalization coefficient used in a radio wave receiving is transmitted.In this technique, the equalization process to be performed on thetransmission path is executed when a radio wave is transmitted inadvance.

Furthermore, there is the problem in the conventional mobilecommunication system, which comprises base stations and mobile stationscommunicating through radio channels, that the quality of CDMA signal orFDMA/TDMA signal as a desired wave signal becomes lower by removing theCDMA signal as a shared wave or FDMA/TDMA signal as a shared wave whenthe frequency sharing is used between FDMA/TDMA method and CDMA methodas different radio wave communication methods.

Moreover, it must be required to construct a mobile communication systemhaving the function of a shared wave canceller for a time-slottedTD-CDMA signal. Further, in order to realize a high qualitytransmission, it is also required to construct a mobile communicationsystem having a diversity function.

The present invention is made to overcome the above problems. It is anobject of the present invention to provide diversity receivers and afrequency sharing mobile communication system having the diversityreceivers. These diversity receivers have the diversity function that iscapable of removing a CDMA signal, a TD-CDMA signal, or a FDMA/TDMAsignal as a shared wave signal without removing a CDMA desired wavesignal, a TD-CDMA desired wave signal, or a FDMA/TDMA desired wavesignal.

DISCLOSURE OF THE INVENTION

According to the present invention as claimed in claim 1, there isprovided a frequency sharing mobile communication system having adiversity receiver comprising CDMA shared wave cancellers for cancelingshared waves on channels of CDMA signals that being frequency sharingwith FDMA/TDMA signals on a frequency axis, and desired wave receiversfor receiving the FDMA/TDMA signals or the CDMA signals. It is therebypossible to receive desired waves with high accuracy and to avoid theoccurrence of a system down caused by the failure of the transmissionpower control of a mobile station as the most serious defect included inCDMA method. Furthermore, it is possible to use information of theremoved shared waves as effective information for other purposes whenthe diversity receiver according to the present invention isincorporated in a base station.

According to the present invention as claimed in claim 2, there isprovided a frequency sharing mobile communication system in that theCDMA canceller for cancelling the CDMA signals sharing with theFDMA/TDMA signals in frequency fields in the diversity receiver,comprises CDMA correlators whose number is equal to the number of aplurality of diversity antennas, a correlation code generator forgenerating CDMA correlation codes and providing them to the CDMAcorrelators, transmission path equalizers whose number is equal to thenumber of the plurality of diversity antennas, an adder for addingoutput signals (hereinafter, signal is frequently abbreviated) from thetransmission path equalizers, a determinator for judging the output fromthe adder, a modulator for inputting the output from the determinatorand for generating and outputting reproduced CDMA signals, transmissionpath simulators, whose number is equal to the number of the plurality ofdiversity antennas, for reproducing interferences in a plurality oftransmission paths based on the output from the modulator, and amicroprocessor for determining coefficients of the transmission pathsimulators based on equalization coefficients of the transmission pathequalizers. It is thereby possible to remove the CDMA shared waves withhigh accuracy.

According to the present invention as claimed in claim 3, there isprovided a frequency sharing mobile communication system in that thedesired wave receiver is a FDMA/TDMA desired wave receiver comprisingdelay elements for delaying each of signals received by the plurality ofdiversity antennas, independently, adders, whose number is equal to thenumber of the plurality of diversity antennas, for removing reproducedCDMA signals, whose number is equal to the number of the plurality ofdiversity antennas, output from the CDMA shared wave cancellers from theoutput of the delay elements by subtraction, desired wave equalizers,whose number is equal to the number of the plurality of diversityantennas, for equalizing the output from the adders, a second adder foradding the outputs from the desired wave equalizers, and a desired wavedemodulator for outputting a desired wave based on the output from thesecond adder. It is thereby possible to receive the FDMA/TDMA desiredwaves with high accuracy.

According to the present invention as claimed in claim 4, there isprovided a frequency sharing mobile communication system in that thedesired wave receiver is a CDMA desired wave receiver comprising delayelements for delaying each of signals received by the plurality ofdiversity antennas, independently, adders for removing reproduced CDMAsignals output from the CDMA shared wave cancellers from the output ofthe delay elements by subtraction, CDMA desired wave correlators, whosenumber is equal to the number of the plurality of diversity antennas,for correlating the output from the adders, a correlation code generatorfor generating CDMA correlation codes and for providing them to the CDMAdesired wave correlators, desired wave equalizers, whose number is equalto the number of the plurality of diversity antennas, for equalizing theoutput from the CDMA desired wave correlators, an adder for adding theoutputs from the desired wave equalizers, and a desired wave demodulatorfor outputting a desired wave based on the output from the adder. It isthereby possible to receive the CDMA desired waves with high accuracy.

According to the present invention as claimed in claim 5, there isprovided a frequency sharing mobile communication system comprises aplurality of the FDMA/TDMA. desired wave receivers and a plurality ofCDMA shared wave cancellers. It is thereby possible to remove aplurality of the CDMA signals as shared waves simultaneously, possibleto avoid the occurrence of a system down, and to receive the desiredwaves with high accuracy.

According to the present invention as claimed in claim 6, there isprovided a frequency sharing mobile communication system comprises theCDMA desired wave receiver and a plurality of the CDMA shared wavecancellers. It is thereby possible to remove a plurality of the CDMAsignals as shared waves simultaneously, possible to avoid the occurrenceof a system down, and to receive the desired waves with high accuracy.

According to the present invention as claimed in claim 7, there isprovided a frequency sharing mobile communication system comprising atleast one base station comprising a plurality of the CDMA shared wavecancellers and a plurality of the FDMA/TDMA desired wave receivers. Itis thereby possible to receive a plurality of the FDMA/TDMA desired wavesignals with high accuracy, possible to avoid the occurrence of a systemdown, and to use the removed the plurality of CDMA shared waves forother purposes.

According to the present invention as claimed in claim 8, there isprovided a frequency sharing mobile communication system comprising atleast one base station comprising a plurality of the CDMA shared wavecancellers and a plurality of the CDMA desired wave receivers. It isthereby possible to receive a plurality of the CDMA desired wave signalswith high accuracy, possible to avoid the occurrence of a system down ofthe base station, and to use the removed the plurality of CDMA sharedwaves for other purposes.

According to the present invention as claimed in claim 9, there isprovided a frequency sharing mobile communication system in that CDMAsignals share frequency fields on a frequency axis with FDMA/TDMAsignals having a same time slot configuration and the TDMA signals andthe CDMA signals are divided by time (hereinafter, time-divided CDMAsignals are referred to as TD-CDMA signals), not in continuous time, inthe same time slot, and the frequency sharing communication system hasdiversity receivers of diversity function, each diversity receivercomprises TD-CDMA shared wave cancellers for canceling the TD-CDMAsignals that being in frequency sharing with the FDMA/TDMA signals, anddesired wave receivers for receiving desired waves. It is therebypossible to receive desired waves with high accuracy and to avoid theoccurrence of a system down caused by the failure of the transmissionpower control of a mobile station as the most serious defect included inCDMA method. Furthermore, it is possible to use information of theremoved shared waves as effective information for other purposes whenthe diversity receiver according to the present invention isincorporated in a base station.

According to the present invention as claimed in claim 10, there isprovided a frequency sharing mobile communication system in that theTD-CDMA canceller for cancelling the TD-CDMA signals sharing with theFDMA/TDMA signals in frequency fields, comprises TD-CDMA correlatorswhose number is equal to the number of a plurality of diversityantennas, a correlation code generator for generating TD-CDMAcorrelation codes and providing them to the TD-CDMA correlators,transmission path equalizers whose number is equal to the number of theplurality of diversity antennas, an adder for adding outputs from thetransmission path equalizers, a determinator for judging the output fromthe adder, a modulator for generating and for outputting reproducedTD-CDMA signals based on the output from the determinater, transmissionpath simulators, whose number is equal to the number of the plurality ofdiversity antennas, for reproducing interferences in a plurality oftransmission paths based on the output from the modulator, and amicroprocessor for determining coefficients of the transmission pathsimulators based on equalization coefficients of the transmission pathequalizers. It is thereby possible to remove the TD-CDMA shared wavesignal with high accuracy.

According to the present invention as claimed in claim 11, there isprovided a frequency sharing mobile communication system in that thedesired wave receiver is a FDMA/TDMA desired wave receiver comprisingdelay elements for delaying each of signals received by the plurality ofdiversity antennas, independently, adders, whose number is equal to thenumber of the plurality of diversity antennas, for removing reproducedTD-CDMA signals output from the TD-CDMA shared wave cancellers from theoutput of the delay elements by subtraction, desired wave equalizers,whose number is equal to the number of the plurality of diversityantennas, for equalizing the output from the adders, a second adder foradding the outputs from the desired wave equalizers, and a desired wavedemodulator for outputting a desired wave based on the output from thesecond adder. It is thereby possible to receive the FDMA/TDMA desiredwaves with high accuracy.

According to the present invention as claimed in claim 12, there isprovided a frequency sharing mobile communication system in that thedesired wave receiver is a TD-CDMA desired wave receiver comprisingdelay elements for delaying each of signals received by the plurality ofdiversity antennas, independently, adders for removing reproducedTD-CDMA signals output from the TD-CDMA shared wave cancellers from theoutput from the delay elements by subtraction, TD-CDMA desired wavecorrelators, whose number is equal to the number of the plurality ofdiversity antennas, for correlating the output from the adders, acorrelation code generator for generating TD-CDMA correlation codes andfor providing them to the TD-CDMA desired wave correlators, desired waveequalizers, whose number is equal to the number of the plurality ofdiversity antennas, for equalizing the output from the TD-CDMA desiredwave correlators, an adder for adding the outputs from the desired waveequalizers, and a desired wave demodulator for outputting apredetermined desired wave based on the output from the adder. It isthereby possible to receive the TD-CDMA desired waves with highaccuracy.

According to the present invention as claimed in claim 13, there isprovided a frequency sharing mobile communication system in that thedesired wave receiver is a CDMA desired wave receiver comprising delayelements for delaying each of signals received by the plurality ofdiversity antennas, independently, adders for removing reproducedTD-CDMA signals output from the TD-CDMA shared wave cancellers from theoutput of the delay elements by subtraction, CDMA desired wavecorrelators, whose number is equal to the number of the plurality ofdiversity antennas, for correlating the output from the adders, acorrelation code generator for generating CDMA correlation codes and forproviding them to the CDMA desired wave correlators, desired waveequalizers, whose number is equal to the number of the plurality ofdiversity antennas, for equalizing the output from the CDMA desired wavecorrelators, an adder for adding the outputs from the desired waveequalizers, and a desired wave demodulator for outputting a desired wavebased on the output from the adder. It is thereby possible to receivethe CDMA desired waves with high accuracy.

According to the present invention as claimed in claim 14, there isprovided a frequency sharing mobile communication system in that thedesired wave receiver is a TD-CDMA desired wave receiver comprisingdelay elements for delaying each of signals received by the plurality ofdiversity antennas, independently, adders for removing reproduced CDMAsignals output from the CDMA shared wave cancellers from the output fromthe delay elements by subtraction in order to cancel the CDMA signalsthat share in the frequency field with the FDMA/TDMA signals, TD-CDMAdesired wave correlators, whose number is equal to the number of theplurality of diversity antennas, for correlating the output from theadders, a correlation code generator for generating TD-CDMA correlationcodes and for providing them to the TD-CDMA desired wave correlators,desired wave equalizers, whose number is equal to the number of theplurality of diversity antennas, for equalizing the output from theTD-CDMA desired wave correlators, an adder for adding the outputs fromthe desired wave equalizers, and a desired wave demodulator for,outputting a desired wave based on the output from the adder. It isthereby possible to receive the TD-CDMA desired waves with highaccuracy.

According to the present invention as claimed in claim 15, there isprovided a frequency sharing mobile communication system mobilecommunication system having a diversity receiver comprising FDMA/TDMAshared wave cancellers for canceling shared waves on FDMA/TDMA signalchannels that being in frequency sharing with CDMA signals on afrequency axis or being in frequency sharing with the TD-CDMA signals ina same time slot, and desired wave receivers for receiving the CDMAdesired wave signals or the TD-CDMA desired wave signals. It is therebypossible to receive the desired waves with high accuracy and to avoidthe occurrence of a system down caused by the failure of thetransmission power control of a mobile station as the most seriousdefect included in CDMA method. Furthermore, it is possible to useinformation of the removed shared waves as effective information forother purposes when the diversity receiver according to the presentinvention is incorporated in a base station.

According to the present invention as claimed in claim 16, there isprovided a frequency sharing mobile communication system in that theFDMA/TDMA shared wave cancellers comprises transmission path equalizerswhose number is equal to the number of the plurality of diversityantennas, an adder for adding outputs from the transmission pathequalizers, a determinator for judging the output from the adder, amodulator for inputting the output from the determinator and forgenerating and for outputting reproduced FDMA/TDMA signals, transmissionpath simulators, whose number is equal to the number of the plurality ofdiversity antennas, for reproducing interferences in the transmissionpath equalizers based on the output from the modulator, and amicroprocessor for determining coefficients of the transmission pathsimulators based on equalization coefficients of the transmission pathequalizers. It is thereby possible to remove the FDMA/TDMA shared waveswith high accuracy.

According to the present invention as claimed in claim 17, there isprovided a frequency sharing mobile communication system in that thedesired wave receiver is a CDMA desired wave receiver comprising delayelements, whose number is equal to the number of a plurality ofdiversity antennas, for delaying each of signals received by theplurality of diversity antennas, independently, adders, whose number isequal to the number of the plurality of diversity antennas, for removingreproduced FDMA/TDMA signals output from the FDMA/TDMA shared wavecancellers from the output of the delay elements by subtraction, CDMAdesired wave correlators, whose number is equal to the number of theplurality of diversity antennas, for correlating the output from theadders, a correlation code generator for generating CDMA correlationcodes and for providing them to the CDMA desired wave correlators,desired wave equalizers, whose number is equal to the number of theplurality of diversity antennas, for equalizing the output from the CDMAdesired wave correlators, an adder for adding the outputs from thedesired wave equalizers, and a desired wave demodulator for outputting adesired wave based on the output from the adder. It is thereby possibleto receive the CDMA desired waves with high accuracy.

According to the present invention as claimed in claim 18, there isprovided a frequency sharing mobile communication system in that thedesired wave receiver is a TD-CDMA desired wave receiver comprisingdelay elements for delaying each of signals received by the plurality ofdiversity antennas, independently, adders, whose number is equal to thenumber of the plurality of diversity antennas,, for removing reproducedFDMA/TDMA signals output from the FDMA/TDMA shared wave cancellers fromTD-CDMA signals designated by a time slot that being equal to the timeslot of the shared waves output from the delay elements, TD-CDMA desiredwave correlators, whose number is equal to the number of the pluralityof diversity antennas, for correlating the output having no shared wavesignals provided from the adders, a correlation code generator forgenerating TD-CDMA correlation codes and for providing them to theTD-CDMA desired wave correlators, desired wave equalizers, whose numberis equal to the number of the plurality of diversity antennas, forequalizing the output from the TD-CDMA desired wave correlators, anadder for adding the outputs from the desired wave equalizers, and adesired wave demodulator for outputting a desired wave based on theoutput from the adder. It is thereby possible to receive the TD-CDMAdesired waves with high accuracy.

According to the present invention as claimed in claim 19, there isprovided a frequency sharing mobile communication system comprising aplurality of the FDMA/TDMA shared wave cancellers and a plurality of theCDMA or TD-CDMA desired wave receivers. It is therefore possible toremove a plurality of the FDMA/TDMA shared wave signals simultaneously,and possible to receive the CDMA desired waves with high accuracy.

According to the present invention as claimed in claim 20, there isprovided a frequency sharing mobile communication system having at leastone base station comprising a plurality of the CDMA shared wavecancellers, a plurality of the TD-CDMA shared wave cancellers, aplurality of the FDMA/TDMA shared wave cancellers, a plurality of theFDMA/TDMA desired wave receivers, a plurality of the CDMA desired wavereceivers, and a plurality of the TD-CDMA desired wave receivers. It isthereby possible to receive a plurality of desired waves with highaccuracy and possible to remove a plurality of shared wavessimultaneously, possible to avoid the occurrence of a system down, andpossible to use the a plurality of shared waves which have been removedfor other purposes.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram showing the entire configuration of a mobilecommunication system to which diversity receivers and frequency sharingmobile communication system having shared wave removing devicesaccording to the present invention are applied.

FIG. 2 is an explanatory diagram showing frequency spectrums offrequency shared radio waves.

FIG. 3 is an explanatory diagram showing the relationship betweenfrequencies and time slots in a frequency sharing mobile communicationsystem based on FDMA/TDMA method, CDMA method, and TD-CDMA method.

FIG. 4 is a block diagram showing a diversity receiver according to thefirst embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of an equalizer for aplurality of shared wave paths and a configuration of a transmissionpath simulator.

FIG. 6 is a block diagram showing a diversity receiver according to thesecond embodiment of the present invention.

FIG. 7 is a block diagram showing a diversity receiver according to thethird embodiment of the present invention

FIGS. 8 and 9 are block diagrams showing a diversity receiver accordingto the fourth embodiment of the present invention.

FIGS. 10 and 11 are block diagrams showing a diversity receiveraccording to the fifth embodiment of the present invention.

FIGS. 12 and 13 are block diagrams showing a diversity receiveraccording to the sixth embodiment of the present invention.

FIGS. 14 and 15 are block diagrams showing a diversity receiveraccording to the seventh embodiment of the present invention.

FIGS. 16 and 17 are block diagrams showing a diversity receiveraccording to the eighth embodiment of the present invention.

FIGS. 18 and 19 are block diagrams showing a diversity receiveraccording to the ninth embodiment of the present invention.

FIGS. 20 and 21 are block diagrams showing a diversity receiveraccording to the tenth embodiment of the present invention.

FIGS. 22 and 23 are block diagrams showing a diversity receiveraccording to the eleventh embodiment of the present invention.

FIGS. 24 and 25 are block diagrams showing a diversity receiveraccording to the twelfth embodiment of the present invention.

FIGS. 26 and 27 are block diagrams showing a diversity receiveraccording to the thirteenth embodiment of the present invention.

FIGS. 28 and 29 are block diagrams showing a diversity receiveraccording to the fourteenth embodiment of the present invention.

FIGS. 30 and 31 are block diagrams showing a diversity receiveraccording to the fifteenth embodiment of the present invention.

FIGS. 32 and 33 are block diagrams showing a diversity receiveraccording to the sixteenth embodiment of the present invention.

BEST MODE FOR EMBODYING THE INVENTION

For a more detailed description of the present invention, a descriptionwill now be given of the best mode for practicing the present inventionwith reference to the accompanying drawings.

Embodiment 1

FIG. 1 is a diagram showing the entire configuration of a mobilecommunication system to which diversity receivers and frequency sharingmobile communication system having shared wave removing devicesaccording to the present invention are applied. In the diagram, 1designates a mobile station such as mobile vehicle communication devicesor mobile portable telephones, 2 denote s a radio base station tocommunicate the mobile station s through radio channels 11. 2 including3A to 3C designates radio base station, connected to the privateswitching apparatus 5 in the private communication system 4 throughwires, with which the mobile station 1 is communicated through radiochannels 12. 6 designates telephone apparatus connected to the privateswitching device 5. 7 designates a satellite communication apparatusthat is connected to the mobile station 1 by using a radio channel 13and also connected to a satellite communication ground base stations 8through satellite channels 14. 9 indicates a public switched telephonenetwork (PSTN) connected to the private switching apparatus 5 and thesatellite communication ground base station 8. The PSTN is alsoconnected to a wire telephone 10. 11 indicates a radio channel throughwhich the mobile station 1 and the radio base station 2 are connected.12 designates a radio channel through which the mobile station 1 and theradio base station 3 in the private communication system 4 areconnected. 13 denotes a radio channel through which the mobile station 1and the satellite communication apparatus 7 are connected. 14 designatesa satellite channel through which the satellite communication apparatus7 and the satellite communication ground base station 8 are connected.The signal communications among the mobile station 1, the radio basestations 2 and 3, and satellite communication apparatus 7 are processedby using a modulation method based on the digital modulation methods(such as FSK, PBSk, QPSK, Pai/4-QDPSK, QAMSK, QGMSK, and the like), andthe radio communications among them are performed based on frequencydivision multiple access (FDMA) method, multi-carrier time-divisionmultiple access (Multi-carrier TDMA) method, code division multipleaccess (CDMA) method, or FDMA method, TDMA/FDD (Frequency duplex)method, TDMA/FDD (Time Division Duplex) method, CDMA/TDMA/FDD method, orCDMA/TDMA/TDD method.

FIG. 2 is an explanatory diagram showing frequency spectrums offrequency shared radio waves based on each communication methoddescribed above. In this case, the FDMA signal 15 and the TDMA signal 16are shared with the CDMA signals 17, 18 and 19 in a part of frequency.

FIG. 3 is an explanatory diagram showing the relationship betweenfrequencies and time slots in a frequency sharing mobile communicationsystem based on the FDMA/TDMA method and TD-CDMA method. As shown inFIG. 3, the TD-CDMA#1 (21) signal, one FDMA/FDD signal (27), threeFDMA/TDD signals (26F, for example), one TDMA signal (21T) are sharing apartial frequency band and are sharing a time slot (T1/R1). The TDMA 23Tsignal, TD-CDMA#3 (23C) signal and a partial frequency are sharing atime slot. In addition, the TD-CDMA#5 (23C) signals, a FDMA/TDMA (27F)signal, three FDMA/TDD signals (26F), a TDMA signal (32T), are sharing apartial frequency band and are sharing a time slot (T3/R3). Although theexplanation about CDMA method is omitted from FIG. 3 because CDMA methodis an obvious one, in the following description, the explanation forCDMA method will be described. As shown in FIG. 3, it is possible toshare a FDMA/TDMA signal and a TD-CDMA signal in a same frequency bandin a same time slot in the diversity receiver and the frequency sharingcommunication system according to the present invention. When the basestation 2 or 3 transmits the TD-CDMA signals to the mobile station 1,that is, because the TD-CDMA signals having adjacent time slots in timecan be processed continuously by using a transmission processingfunction in a down-link, the transmission style becomes TDM (TimeDivision Multiplex). This process is same as the process of the casethat a plurality of TDMA signals in adjacent time slots are transmittedfrom the transmission device in one of base stations to a mobilestation. Hereinafter, it is not otherwise indicated that thetransmission style from the base station in a down-link is TDM.

FIG. 4 is a block diagram showing a diversity receiver according to thefirst embodiment of the present invention. In the diagram, 69 designatesa shared wave removing apparatus for removing CDMA signals or TD-CDMAsignals (hereinafter referred to as shared wave canceller), 79 denotes adesired wave receiver for selecting FDMA/TDMA signals. 41 and 42indicate diversity antennas (hereinafter referred to as antennas), 43and 44 designate conversion amplifiers for amplifying the radiofrequency signals received by the antennas 41 and 42 by a predeterminedamplification factor, for mixing them with a local oscillated signaloutput from a local oscillator (omitted from the diagram), and forconverting them to intermediate frequency signals. Here, theintermediate frequency signals include the intermediate frequencycomponent f0 of the shared wave CDMA or TD-CDMA signals and theintermediate frequency component f0+nfd of desired wave FDMA or TDMAsignals as the desired wave signals. 45 and 46 designate CDMA or TD-CDMAorthogonal code correlators (hereinafter referred to as correlators) forinputting the intermediate frequency signal output from the conversionamplifiers 43 and 44 and for selecting a symbol rate signal componentfrom the shared wave channel CDMA or TD-CDMA signals.

This first embodiment relates to the diversity receiver when the sharedwave is the CDMA signal and the desired wave is the FDMA/TDMA signal.

A description will now be given of the operation.

Received signals that have been received by the diversity antennas 41and 42 and then correlated by the correlators 45 and 46 are transferredto the shared wave multi-path propagation equalizers 48 and 49(hereinafter referred to as equalizers) to remove the interferencesoccurred by the multi-path propagations. These signals output from theequalizers are then added by the adder 50 in order to get shared channelsignals in which an interference component has been removed. The adder50 operates based on a selection synthesis, an equal-gain synthesis, amaximum ratio synthesis, and a least-square synthesis functions. Theoutput from the adder 50 is judged by the determinator 51, so that theshared channel information is obtained.

When the diversity receiver of the first embodiment is used as the basestation receiver in the frequency sharing mobile communication system,it is possible to use the shared channel information, namely the sharedwave information 57, as the information about the mobile station fromwhich its signal is transmitted. 52 designates a shared channel digitalmodulator for modulating the output signal from an internal oscillator(not shown) by using the shared channel digital information output fromthe determinator 51 and the correlation code signal output from the CDMAor TD-CDMA orthogonal code correlator 47 for the shared CDMA or TD-CDMAsignal, and for regenerating an internal shared channel modulationsignal. This shared channel signal output from this modulator has nonoise signal component that is included in the input signal received bythe determinator 51. Accordingly, even if the addition operation(specifically speaking, this process is a subtraction process) betweenthe received signal and the shared wave regenerated component isperformed, it can be prevented to add the noise signal component. Themodulated shared wave reproduced CDMA signal or the reproduced TD-CDMAsignal is transferred to both of the transmission multi-path simulators(A4 and A5) 55 and 56 for simulating transmission multi-paths. Thetransmission multi-path simulator (A4) 55 simulates the transmissionfactor of the shared wave received by the antenna 41. The transmissionmulti-path simulator (B4) 56 simulates the transmission factor of theshared wave received by the antenna 42. The coefficients representingthe characteristics of both transmission simulators 55 and 56 aregenerated by the inverse matrixes of the coefficients of the shared wavetransmission path interference equalizers 48 and 49. This inversematrixes are generated by the microprocessor 60.

The transmission path of the radio waves received by the antenna 41 isformed by using the coefficient of the equalizer 48 by the transmissionsimulator 55. The CDMA shared wave canceller 69 comprises the circuitsdescribed above and has the function as the regenerating means forregenerating the diversity received shared wave.

71 and 72 designate delay circuits for inputting the intermediatefrequency signal output from each of the conversion amplifiers 43 and 44and for delaying it by a predetermined time period. 73 and 74 denoteadders for adding the reversed values of the output signals from thetransmission simulators 55 and 56 and the output signals from the adders71 and 72. These adders operate as the shared wave removing means. 75and 76 indicate desired wave equalizers for selecting the FDMA/TDMAdesired signals from the output signals, in which the shared channelsignals have been removed, from the adders 73 and 74 and for amplifyingthe FDMA/TDMA desired signals. By the desired wave equalizers 75 and 76,the interferences of transmission paths received by the diversityantennas 41 and 42 can be removed. 77 indicates an adder that is formedbased on a selection synthesis, an equal-gain synthesis, a maximum ratiosynthesis, and a least-square syntheses functions. 78 designates adesired wave demodulator as a desired wave determinator for inputtingthe output signal from the adder 77, for judging digital information,and for outputting a desired wave information.

The desired wave receiver 79 comprising the circuits described aboveinputs the reproduced CDMA signal output from the shared wave canceller69, removes the shared wave, and outputs the desired wave information.

Specifically, although the correlators 45 and 46, and the desired waveequalizers 75 and 76 include amplifiers and filters, these are omittedfrom the diagram. However, the amplifiers having a predeterminedamplification degree and the filters used for selecting a band areincorporated in the circuits that require them. The descriptiondescribed above is also used for the following embodiments. In additionto this, these functions can be formed by a hardware (H/W) or a software(S/W).

The delay elements 71 and 72 delay the signals received by the antennas41 and 42 by the time period required for processing the shared wavesignals by the shared wave canceller 69 comprising the diversity sharedwave regenerating function comprising the Correlators 45 and 46, theequalizers 48 and 49, the adders 50, the determinater 51, the modulator52, and the transmission path simulators 55 and 56.

The delayed time period of the delay elements 71 and 72 is set to thetime period of an integral multiple of the highest clock rate (or thenumber of the highest symbol clocks) of the reciprocal of an integralmultiple of the highest clock rate, or of a combination of them when aplurality of symbol clock rates in the frequency sharing mobilecommunication system is used. Specifically, when TD-CDMA is the sharedchannel, it is easily performed to judge the delay time period bycounting the number of symbols from the top position of the time slot.Then, the delay time period of the delay elements 71 and 72 are set byfitting the number of the symbol clocks to the processing time of theshared wave canceller, that is, by setting the number of the processingsteps of the microprocessor 60. Furthermore, in this case, when thedelay elements 71 and 72 are made up of memories and when the readingtime period is counted by the operation processing steps, the delay timeperiod of the shared wave canceller 69 can be fitted to the delay timeperiod of the delay elements 71 and 72 with high accuracy.

Next, the description will now be given of the operation of thetransmission path simulators 55 and 56 shown in FIG. 4.

FIG. 5 is a diagram showing the configuration of the equalizers 48 and49 for a plurality of shared wave paths and the configuration of thetransmission path simulators 55 and 56.

In the equalizer 48 of the shared wave transmission paths, three delayelements 81 a, 81 b, and 81 c delay the input signals by the unit timeperiod Tc. The multipliers 82 a, 82 b, 82 c, and 82 d multiply the inputsignals inputted to the equalizers 48 and 49 of the shared wave pathsand the three delay signals obtained by these equalizers by thecoefficients M0, M1, M2, and M3, respectively. The operation results ofthe multiplies are added by the adders 83 a, 83 b, and 83 c in order toobtain the equalized signals Coefficients by which the distortion of thetransmission path can be compensated by the training sequence placed atthe top position of each time slot shown in FIG. 3 are used. In theconventional techniques mentioned previously, although an example towhich this type equalizer is applied for continuous CDMA signals hasbeen disclosed, these conventional techniques disclosed no transmissionpath simulators 55 and 56.

The transmission path simulators 55 and 56 shown in FIG. 5 comprisethree delay elements 85 a, 85 b, and 85 c, four multipliers 86 a, 86 b,86 c, and 86 d, three adders 87 a, 87 b, and 87 c, and the coefficientsetting unit 88.

The four multipliers 86 a, 86 b, 86 c, and 86 d input the modulatedsignal output from the modulator 52 and multiply it by the coefficientscorresponding to each multiplier, respectively. The operation result isoutput to the delay elements 85 a, 85 b, and 85 c or to the adders 87 a,87 b, and 87 c. The output signal from the adder 87 c is the signal thatis reproduced by using the transmission path delay signal for thetransmission paths. When this output signal is compared with thereceived signal by the antennas 41 and 42, this output signal includesno interference signals other than the shared wave and includes nonoises. That is, the transmission simulators 55 and 56 reproduce onlythe signal component having the transmission path delay distortion ofthe shared wave in the received signal by the antennas 41 and 42 andthen output it.

As described above, according to the embodiment 1, the transmission pathsimulators 55 and 56 in the CDMA shared wave canceller or TD-CDMA sharedwave canceller reproduce the shared wave. The reproduced shared wavegives the predetermined delay characteristic necessary to cancel-processthe signals received through the diversity antennas 41 and 42, and isoutput to the desired wave receiver 79. Then, the signals obtained bythe antennas 41 and 42 are delayed by the delay elements 71 and 72. Bythe adders 73 and 74, the delayed signals are added with theindependently reproduced shared wave signal obtained by the transmissionpath simulators 55 and 56 in the shared wave canceller 69.

In a case that the diversity receiver having the shared wave canceller69 of the CDMA signal or the TD-CDMA signal according to the embodiment1 is incorporated in the base station 2, for example, when a failure ofthe transmission power control function of the mobile station 1 ishappened and when an excessive signal power is transmitted from themobile station 1, it can be avoided to happen the system down of theentire mobile communication system, because the diversity receiver ofthe embodiment 1 incorporated in the base station 2 is capable ofremoving the signal having the excessive signal power. Specifically,there is the effect that the diversity receiver gives a means possibleto avoid the occurrence of the system down caused by the failure of thetransmission power control of the mobile station 1 as the most seriousdefect included in CDMA method.

In this case, because the mobile communication system is constructed sothat the transmission signal having the excessive signal power is causedonly in an up-link from the mobile station 1 to the base station 2, thediversity receiver having this function is incorporated only in the basestation 2. This causes to decrease the cost of equipments of the entiremobile communication system. At the same time, it can be achieved togive a means possible to avoid the system down of the mobilecommunication system efficiently.

In addition, as shown in FIG. 3, there is the effect to reduce thesearching time to search a diffusion code in the reverse diffusionfunction that is the operation object of the correlator in the diversityreceiver by agreeing the initial value of the diffusion code to the topposition of the time slot after a CDMA signal is changed to a time slot.In general, the shared wave information is unnecessary information formobile stations. There is a case that the shared wave information isused for other communication channels in the same system in the basestation. Therefore there is a possibility that the shared waveinformation becomes the useful information in the base station, and itcan be used as the output of the receiver incorporated in the basestation.

Specifically, in the embodiment 1 and other embodiments 2 to 16according to the present invention that will be described later, thenumber of the diversity antennas is two, but the present invention isnot limited by this configuration. For example, the present inventioncan be applied to mobile communication system in which the number of thediversity antennas are three or more and it can be acceptable to usevarious types of shapes of the diversity antennas and it can be achievedthat each of these cases has the effect that is same as the effect ofthe embodiment 1.

Embodiment 2

FIG. 6 is a block diagram showing a diversity receiver according to thesecond embodiment of the present invention. In the diagram, 99designates a desired wave receiver for selecting a CDMA signal or aTD-CDMA signal. The desired wave receiver 99 comprises desired wavecorrelators 91 and 92, a desired wave correlation code generator 93,desired wave equalizers 94 and 95, an adder 96, and a desired wavedemodulator 97. Specifically, since the shared wave canceller 69 andother components when the shared wave is the CDMA signal are same asthose of the first embodiment, the same reference numbers are used andthe explanation for them is omitted here.

The embodiment 2 relates to the diversity receiver when the shared waveis used based on CDMA method and the desired wave is used in based onCDMA method.

A description will now be given of the operation.

The intermediate frequency signals (in this case, it is the base bandsignal. Specifically, because when F0=0 Hz, the intermediate frequencysignal becomes the base band signal, hereinafter both are notdistinguished.) output from the converters 43 and 44 are given to theshared channel correlators 45 and 46. The operation of each of theshared channel correlators 45 and 46 is same as that of the correlatorsused in the embodiment 1, therefore, the explanation for them is omittedhere.

The intermediate frequency signals output from the converters 43 and 44are input to the delay elements 71 and 72. Here, both signals, thesignals delayed by predetermined time periods executed by the delayelements 71 and 72 and the output from the shared wave canceller 69 areadded by the adders 73 and 74 per each of the diversity antennas 41 and42.

The signals in which the shared wave has been removed are input to bothof the desired wave correlator; 91 and 92. The desired wave correlators91 and 92 output: desired wave diversity CDMA signals or the TD-CDMAsignals.

These two signals output from the desired wave correlators are processedby the equalizers 94 and 95 per transmission path, respectively. Theadded signal by the adder 96 is output as the desired wave informationby the desired wave determinator 97.

Specifically, because other components are same as those in thediversity receiver of the embodiment 1, therefore, the same referencenumbers are used and the explanation for them is omitted here.

As described above, according to the embodiment 2, it is possible toprovide the diversity receiver applied to the case that the shared waveis the CDMA signal or the TD-CDMA signal and the desired wave is theCDMA signal or the TD-CDMA signal. This diversity receiver is capable ofreceiving the desired wave correctly and it can be provided to realize ahigh accuracy radio communication. In addition to this feature, there isthe effect that the diversity receiver has the function to avoid theoccurrence of the system down caused by the failure of the transmissionpower control of the mobile station 1 as the most serious defectincluded in CDMA method.

In this case, because the mobile communication system is constructed sothat the transmission signal having the excessive signal power is causedonly in an up-link from the mobile station 1 to the base station 2, thediversity receiver having this function is incorporated only in the basestation 2. This causes to decrease the cost of equipments of the entiremobile communication system. At the same time, it can be achieved togive a means possible to avoid the occurrence of a system down in themobile communication system efficiently.

Embodiment 3

FIG. 7 is a block diagram showing a diversity receiver according to thethird embodiment of the present invention. In the diagram, 119designates a shared wave canceller for removing a FDMA/TDMA signal, 101and 102 denote shared wave equalizers, 103 indicates an adder, 104designates a determinator, 105 designates a modulator, 106 and 107denote transmission simulators, and 113 indicates a microprocessor.

The diversity receiver of the embodiment 3 comprises the shared wavecanceller 119 for removing the FDMA/TDMA signal and the desired wavereceiver 99 for selecting the CDMA signal. The desired wave receiver 99has the same configuration of the diversity receiver of the embodiment2.

A description will now be given of the operation.

The signals received through the two diversity antennas 41 and 42 areinput to the shared wave equalizers 101 and 102 through the converters43 and 44 and the interference caused in each of these signaltransmission paths is removed. Then, the signals are added by the adder103. The added signal is judged by the determinator 104 to obtain theshared wave information. Because this signal is the shared waveinformation of the signal based on FDMA/TDMA method, it can be utilizedas the communication information output signal between the base station2 and the mobile station 1 which uses the shared wave as a communicationchannel.

The shared wave information is modulated by the modulator 105 and thenreproduced by the transmission path simulators 106 and 107 as the signalincluding the communication path interference per each antenna. In thiscase, the coefficient of the transmission path simulator 106 isgenerated in the inverse matrix process using the coefficient of theequalizer 101 executed by the microprocessor 113. In addition, thecoefficient of the transmission path simulator 107 is generated in theinverse matrix process using the coefficient of the equalizer 102executed by the microprocessor 113.

The intermediate frequency signals output from the converters 43 and 44are input to the shared wave canceller 119, as described previously, andalso inputted to the delay circuits 71 and 72, simultaneously, where itis delayed by a predetermined time period.

The output signals output from the transmission path simulators 106 and107 are inverted and then input to the adders 73 and 74 in which thisinverted signal is added to the output from the desired wave delaycircuits 71 and 72, respectively. In the output signal from each of theadders 73 and 74, the shared channel signal component has been removed.

Next, the output signal added by each of the adders 73 and 74 has thecode correlation only of the desired wave by the CDMA signal or TD-CDMAsignal desired wave code correlators 91 and 92, and then equalized bythe desired wave equalizers 94 and 95, and demodulated by the desireddemodulators 97. These operations are same as those of the diversityreceiver as the embodiment 2, therefore the explanation for them isomitted here.

As described above, according to the embodiment 3, only the shared wavesignal is transformed from the input signal including the desired wavesignal which has been modulated digitally and received by the antennas41 and 42 and interference shared wave signal that interferes with thisdesired wave signal. That is, the diversity receiver of the embodiment 3transforms only the shared wave signal from the input signal anddemodulates the transformed shared wave signal digitally, modulated theinternal transmission wave digitally by using the shared waveinformation, and then inputs the obtained digital demodulated signalinto the transmission path simulators 106 and 107 in order to simulatethe transmission path of each of the diversity antennas, the number ofthem is equal to the number of the diversity antennas. Thereby, themodulated signal has the transmission path distortion. Then, thediversity reproduced shared wave signal is removed from the signals,whose number is equal to the number of the diversity antennas, that areobtained by using the diversity received signal delayed by thepredetermined time period. This causes to remove jamming caused by theshared wave and it is possible to receive the desired wave signal withhigh quality even if the input radio wave includes the shared wavesignal in addition to the desired wave signal.

Furthermore, the delay circuits to delay the input signal by a timeperiod that is integral multiple of the symbol time of the transmissioninformation are incorporated and the total time period of the processesin the diversity received shared wave regenerating circuit is set tointegral multiple of the symbol time period, and the delayed inputsignal is adjusted in phase to the reproduced shared wave signal.Thereby, it can be achieved to have the effect that the shared wavesignals are removed from the input signals with high accuracy.

Embodiment 4

FIGS. 8 and 9 are block diagrams showing a diversity receiver accordingto the fourth embodiment of the present invention. In the diagrams, 69and 79 designate the shared wave canceller and the desired wave receiverin the diversity receiver of the embodiment 1, respectively. 139 denotesa second shared wave canceller for removing the desired wave obtained bythe desired wave receiver 79 from the input signal and for transformingthe shared wave. Specifically, the shared wave canceller 69 for the CDMAsignal and the TD-CDMA signal and the FDMA/TDMA desired wave receiver 79are same as those of the embodiment 1. Therefore the explanation forthem is omitted.

The diversity receiver of the fourth embodiment comprises the secondshared wave receiver 139 for removing the desired wave signal from thediversity input signal in order to obtain the shared wave with highaccuracy, in addition to the configuration of the diversity receiver ofthe first embodiment.

A description will now be given to the operation.

According to the output information signal output from the desired wavedeterminator 78, namely the desired wave demodulator, in the desiredwave receiver 79, the modulator 125 in the second shared wave receiver139 outputs the modulated signal. This modulated signal is inputted tothe transmission simulators 126 and 127 in order to reproduce thediversity signal received by the diversity antennas. The coefficient ofeach of the transmission simulators 126 and 127 is made by using theinverse matrix of the coefficient of the desired wave equalizers 75 and76, respectively. This process is executed by the microprocessor.

In the diversity receiver of the fourth embodiment, the desired wavestransmitted from the desired wave receiver 79 through the transmissionpath simulators 126 and 127 are subtracted by the adders 123 and 124with the delayed signal obtained by the delay elements 121 and 122.Accordingly, the desired wave output from the desired wave receiver 79is considered to be the shared wave. Then, the second shared wave thatis obtained from the signal obtained by the subtraction process of theadders 123 and 124 is correlated and detected by the correlators 128 and129. This second shared wave is equalized by the equalizers 130 and 131and then provided to outside as the second shared wave information 2after through the adder 132 and the determinator 133.

As described above, according to the fourth embodiment, because theshared wave canceller 69 and the shared wave receiver 139 areincorporated, it can be achieved that the desired wave receiver 79receives the desired wave signal with high accuracy and the shared wavesignal in which the interference caused by the desired wave has beenremoved can be obtained by the second shared wave receiver 139. Thiscauses to realize the high accuracy radio communication. Furthermore, itcan be achieved to give a means possible to avoid occurrences of thesystem down caused by the failure of the transmission power control inthe mobile station 1 as the most serious defect included in CDMA method.Specifically, the base station incorporating the diversity receiver hasthe effect that can avoid the occurrence of the system down.

Embodiment 5

FIGS. 10 and 11 are block diagrams showing a diversity receiveraccording to the fifth embodiment of the present invention. In thediagrams, 69 designates the shared wave canceller, 139 denotes thesecond shared wave receiver, and 99 indicates the desired wave receiver.

The diversity receiver of the embodiment 5 is applied to the case thatthe shared wave and the desired wave are CDMA signals or TD-CDMAsignals. Specifically, the shared wave canceller 69 and the desired wavereceiver 99 are same in configuration as those in the embodiment 2,therefore the explanation of them is omitted.

In the shared wave receiver 139, the desired wave information outputfrom the desired wave determinator 97 in the desired wave receiver 99 isinputted to the modulator 137. The CDMA diffusion code series signal ofthe desired wave is transmitted from the desired wave correlation codegenerator 93 to the modulator 137 in the shared wave receiver 139. Thereproduced CDMA signal or the TD-CDMA signal is added with thetransmission path distortion by the transmission path simulators 126 and127, and then the inverted value thereof is inputted to the adders 123and 124. By the adders 123 and 124, the desired wave signal output fromthe transmission path simulators 126 and 127 is removed from the inputsignal delayed by a predetermined time period by the delay elements 121and 122. The delay time period of the delay elements 121 and 122 aretimes that are the sum of the delay time of the delay elements 71 and 72in the desired wave receiver 99 and the delay time in the desired wavereceiver 99, that is, the delay time is the signal processing timeperiod from the adders 73 and 74 to the desired wave determinator 97.

The processing time of the desired wave receiver 99 is set to the timeperiod of an integral multiple of the clock time whose unit is theinformation transmission speed, the symbol clock rate, of the reciprocalof an integral multiple of the clock time, or of a combination of them.Thereby, it can be easily to fit the delay time of the delay elements121 and 122 by using the unit of the symbol rate. Specifically, theoperations of other configuration components in the second shared wavereceiver 139 such as the adders 123, 124, the microprocessor 134, theshared wave equalizers 130, 131, the adder 132, the shared wavedeterminator 133 and the like, for example, are same as those in thesecond shared wave receiver 139 of the fourth embodiment, therefore theexplanation of them is omitted here.

As described above, according to the fifth embodiment, because theshared wave canceller 69 and the shared wave receiver 139 areincorporated, it can be achieved that the desired waves are receivedwith high accuracy and the shared wave signals in which the interferencecaused by the desired wave has been removed are obtained. Furthermore,it can be achieved to give a means possible to avoid occurrences of thesystem down caused by the failure of the transmission power control inthe mobile station 1 as the most serious defect included in CDMA method.Specifically, the base station incorporating the diversity receiver hasthe effect that can avoid the occurrence of the system down.

Embodiment 6

FIGS. 12 and 13 are block diagrams showing a diversity receiveraccording to the sixth embodiment of the present invention. In thediagrams, 119 designates the shared wave canceller, 149 denotes thesecond shared wave receiver, 99 indicates the desired wave receiver.Specifically, the shared wave canceller 119 is the same in configurationas that of the embodiment 3 and the desired wave receiver 99 is the samein configuration as that of the embodiment 2, therefore the explanationof them is omitted.

The diversity receiver of the sixth embodiment is applied to the case inwhich the desired wave is the CDMA signal or the TD-CDMA signal. Thisdiversity receiver can receive this desired wave. In addition to thisfunction, it can remove the CDMA desired wave signal output from thedesired wave receiver 99 from the input signal received by the diversityantennas 41 and 42 and gets the FDMA/TDMA shared wave signal with highaccuracy.

A description will now be given of the operation.

Because the processing time period (delay time period) of the FDMA/TDMAshared wave canceller 119 has a value that is different from theprocessing time (namely, the delay time) of the shared wave canceller 69for the CDMA signal or TD-CDMA signal used in the fourth embodimentshown in FIGS. 8 and 9 and also used in the fifth embodiment shown inFIGS. 10 and 11, the delay time of each of the delay elements 71 and 72in the desired wave receiver 99 is different from the delay time of eachof the delay elements 71 and 72 in the desired wave receivers 79 and 99of the fourth and fifth embodiments.

Therefore, the delay time period of each of the delay elements 71 and 72in the desired wave receiver 99 is changeable corresponding to theprocessing time period of the shared wave canceller 119. When the delaytime period of each of the delay elements 71 and 72 is changed, it ischanged per integral multiple or the data symbol clock or per reciprocalof an integral multiple of the data symbol clock.

Specifically, the operations of other components in the second sharedwave receiver 149, for example, the adders 123 and 124, themicroprocessor 134, the shared wave equalizers 141 and 142, the adder143, the shared wave determinater 144 are same as those in the sharedwave receiver 139 of the fourth embodiment, therefore, the explanationof them is omitted here.

As described above, according to the embodiment 6, because the sharedwave canceller 119 and the shared wave receiver 149 and the desired wavereceiver 99 are incorporated, it can be achieved that the desired wavecan be received with high accuracy and the shared wave information inwhich the interference caused by the desired wave has been removed canbe obtained. This causes to realize the radio communication with highquality.

Embodiment 7

FIGS. 14 and 15 are block diagrams showing a diversity receiveraccording to the seventh embodiment of the present invention. In thediagrams, 69 designates the shared wave canceller, 79 denotes thedesired wave receiver, 159 indicates the second shared wave receiver.Specifically, the shared wave canceller 69 and the desired wave receiver79 are same as those used sin the first embodiment, therefore theexplanation for them is omitted here.

The diversity receiver of the embodiment 7 removes the CDMA desired wavesignal output from the desired wave receiver 79 and the FDMA/TDMA sharedwave signal output from the shared wave canceller 69 from the inputsignal received by the antennas 41 and 42 in order to get the secondshared wave signal with high accuracy.

A description will now be given of the operation.

The output signal of the shared wave canceller 69 is given to the secondshared wave receiver 159 through the transmission paths 153 and 154. Thedelay elements 151 and 152 in the second shared wave receiver 159 delaythe shared wave reproduced signal by the sum of the processing timerequired in the adders 73 and 74, the equalizers 75 and 76, the adder77, the determinator 78, the modulator 125, and the transmissionsimulators 126 and 127 in the desired wave receiver 79 and the canceller159. Other operations are same as those of the diversity receiver of thefourth embodiment.

The delay time period of the delay elements 151 and 152 in the secondshared wave receiver 159 can be set to an integral multiple of the datasymbol rate clock, the reciprocal of an integral multiple, or thecombination of them. Furthermore, the sum of the processing time of theadders 73 and 74, the equalizers 75 and 76, the adder 77, thedeterminator 78, the modulator 125, and the transmission path simulators126 and 127 in the desired wave receiver 79 can also be set to anintegral multiple of the data symbol rate clock, the reciprocal of anintegral multiple, or a combination of them. The setting of this delaytime period and the processing time can be easily set by using acombination of the hardware (H/W) and a software (S/W).

Specifically, for example, the operations of other configurationcomponents in the second shared wave receiver 159, such as the adders123, 124, the microprocessor 134, the shared wave equalizers 130, 131,the adder 132, and the shared wave determinator 133 are same as those inthe second shared wave receiver 139 of the embodiment 4, therefore theexplanation for them is omitted.

As described above, according to the embodiment 7, because the sharedwave canceller 69 and the shared wave receiver 159 and the desired wavereceiver 79 are incorporated, it can be achieved that the desired wavecan be received with high accuracy and the shared wave information inwhich the interference caused by the desired wave has been removed canbe obtained. This causes to realize the radio communication with highquality. According to the embodiment 7, there is the effect that whenthe desired wave signal output from the desired wave receiver 79 is theinterference wave to the second shared wave signal, this desired wavesignal as the interference wave can be removed with high accuracy. Thatis, the desired wave signal in addition to the first shared wave signalcan be removed simultaneously, so that there is the effect that theshared wave receiver 159 can receive the second shared wave signal withhigh accuracy.

Embodiment 8

FIGS. 16 and 17 are block diagrams showing a diversity receiveraccording to the eighth embodiment of the present invention. In thediagrams, 69 designates the shared wave canceller, 99 denotes thedesired wave receiver, 169 indicates the second shared wave receiver.Specifically, the shared wave canceller 69 is same as that used in theembodiment 1, and the desired wave receiver 99 is same as that in theembodiment 2, therefore the explanation for them is omitted here.

The diversity receiver of the embodiment 8 removes the CDMA desired wavesignal output from the desired wave receiver 99 and the CDMA shared wavesignal output from the shared wave canceller 69 from the input signalreceived by the antennas 41 and 42 in order to get the second sharedwave signal with high accuracy. When the second shared wave signal isreceived, the diversity receiver of the embodiment 8 can use the signalobtained by subtracting the first shared channel signal wave with thesecond shared wave signal. However, the diversity receiver of theembodiment 8 can be applied to the cases when both of the desired waveand the shared wave are the CDMA signals, or the TD-CDMA signal, or thecombination of them. Further, the phase of the canceller signal to besubtracted is matched to the phase of the shared wave in order toincrease the accuracy of the canceling operation.

A description will now be given of the operation.

The delay time period of the delay elements 151 and 152, incorporated inthe second shared wave receiver 169 in order to delay the shared wavesignal obtained by the shared wave canceller 69 by a predetermined delaytime period, can be set to an integral multiple of the data symbol rateclock, the reciprocal of an integral multiple of the symbol clock rate,or the combination of them. Furthermore, the sum of the processing timefrom the adders 73 and 74, the correlators 91 and 92, the desired waveequalizers 94 and 95, the adder 96, the desired wave determinator 97 inthe desired wave receiver 99 to the modulator 161 and the transmissionpath simulators 126 and 127 in the second shared wave receiver 169 canalso be set to an integral multiple of the data symbol rate clock, thereciprocal of an integral multiple of the symbol clock rate, or thecombination of them.

Specifically, for example, the operations of other configurationcomponents in the second shared wave receiver 169, for example, theadders 123 and 124, the microprocessor 134, the shared wave equalizers130 and 131, the adder 132, and the shared wave determinator 133 aresame as those used in the second shared wave receiver 139 of theembodiment 4, therefore the explanation of them is omitted here.

As described above, according to the embodiment 8, the desired wavesignal can be received correctly and the shared wave information withoutinterference from the desired wave can be obtained, so that it isachieved to realize the high accuracy radio communication. Specifically,since the desired wave signal in addition to the first shared wavesignal are removed simultaneously, it is possible to get the effect thatthe second shared wave signal can be received with high accuracy. Whenthe desired wave signal output from the desired wave receiver 99 is theinterference wave to the second shared wave signal, the desired wavesignal as the interference wave can be removed with high accuracy.Furthermore, when the delay time period of the plurality of delayelements is an integral multiple of the data symbol clock or areciprocal of an integral multiple or a combination of them, theadjustment process of the total delay time can be easily performed. Inaddition, it is easily performed to set various time condition in thesystem by matching the delay time or the initial time of the processingtime period to the initial time of the time slot when the time-slottedTD-CDMA signal is used instead of the continuous CDMA signal. By usingthe TD-CDMA signal, it is easily processed to set various delay timeperiods in the system.

Embodiment 9

FIGS. 18 and 19 are block diagrams showing a diversity receiveraccording to the ninth embodiment of the present invention. In thediagrams, 119 designates the shared wave canceller, 99 denotes thedesired wave receiver, 179 indicates the second shared wave receiver.Specifically, the shared wave canceller 119 is same as that of theembodiment 3, and the desired wave receiver 99 is same as that of theembodiment 2, therefore the explanation of them is omitted here.

The diversity receiver of the embodiment 9 removes the CDMA desired wavesignal output from the desired wave receiver 99 and the FDMA/TDMA sharedwave signal output from the shared wave canceller 119 from the inputsignal received by the diversity antennas 41 and 42 in order to obtainthe second shared wave signal accurately.

A description will now be given of the operation.

The delay time of each of the delay elements 171 and 172 in the secondshared wave receiver 179 is set to an integral multiple of a data symbolrate clock, a reciprocal of an integral multiple, or a combination ofthem. Furthermore, the sum of the processing of the adders 73 and 74,the Correlator 91 and 92, the desired wave equalizers 94 and 95, theadder 96, the desired wave determinator 97 in the desired wave receiver99, and the modulator 137 and the transmission path simulators 126 and127 in the second shared wave receiver 179 can also be set to anintegral multiple of the data symbol rate clock, the reciprocal of anintegral multiple, or a combination of them. The setting of this delaytime period and the processing time can be easily set by using acombination of the hardware (H/W) and a software (S/W). Specifically,the operations of other components, for example, the adders 123 and 124,the microprocessor 134, the shared wave equalizers 14L and 142, theadder 143, the shared wave determinater 144 are same as those in thesecond shared wave receiver 139, therefore the explanation of them isomitted here.

As described above, according to the embodiment 9, the desired wavesignals can be received correctly and the shared wave informationwithout interference from the desired waves can be obtained, so that itis achieved to realize the high accuracy radio communication. When thedesired wave signal output from the desired wave receiver 99 is theinterference wave to the second shared wave signal, the desired wavesignal as the interference wave can be removed with high accuracy.Furthermore, when the delay time period of the plurality of delayelements is an integral multiple of the data symbol clock or areciprocal of an integral multiple or a combination of them, theadjustment process of the total delay time can be easily performed.

Embodiment 10

FIGS. 20 and 21 are block diagrams showing a diversity receiveraccording to the tenth embodiment of the present invention. In thediagrams, 69 designates the shared wave canceller for removing the CDMAsignal as the shared wave, and 79, 189, 199 each denotes the desiredwave receiver for receiving the FDMA/TDMA signal as the desired wave.Specifically, the shared wave canceller 69 is same as that used in theembodiment 1, and each of the desired wave receivers 79, 189, and 199 issame as the desired wave receiver used in the embodiment 1, thereforethe explanation of them is omitted here.

The diversity receiver of the embodiment 10 comprises a plurality of thedesired wave receivers for receiving the FDMA/TDMA signal as the desiredwaves. By this configuration, a plurality of desired waves can bereceived efficiently with high accuracy.

The shared wave canceller 69 is capable of removing the CDMA signal orthe TD-CDMA signal which interferes or jams up to receive the desiredwave transmitted to the diversity antennas 41 and 42.

The signal obtained by removing the shared wave signal as the outputsignal from the shared wave canceller 69 from the input signaltransmitted to the diversity antennas 41 and 42, that is, the outputsignals from the adders 73 and 74 in the desired wave receiver 79 areinput to the desired wave equalizers 75 and 76 in the first desired wavereceiver 79, the desired wave equalizers 181 and 182 in the seconddesired wave receiver 189, . . . , the desired wave equalizers 191 and192 in the n-Th desired wave receiver 199. Each of the desired wavereceivers 79, 189, and 199 incorporates the filter for selecting onlythe FDMA/TDMA signal to be received, so that the target channel signalcan be received.

As described above, according to the embodiment 10, because thediversity receiver of the embodiment 10 comprises one shared wavecanceller and a plurality of desired wave receivers, there is the effectthat it can be applied to the case in which the desired wave signals canbe received accurately when the CDMA shared wave has a strong signalpower and this CDMA shared wave can be removed. Furthermore, when thediversity receiver of the embodiment 10 is used as a receiver in a basestation, the shared wave that is the target signal to be removed can beused efficiently as useful channel information.

Embodiment 11

FIGS. 22 and 23 are block diagrams showing a diversity receiveraccording to the eleventh embodiment of the present invention. In thediagrams, 69 designates the shared wave canceller for removing the CDMAsignal as the shared wave, and 99, 209, 219 each denotes the desiredwave receiver for receiving the CDMA signal as the desired wave.Specifically, the shared wave canceller 69 is same as that used in theembodiment 1, and each of the desired wave receivers 99, 209, and 219 issame as the desired wave receiver used in the embodiment 2, thereforethe explanation of them is omitted here.

The diversity receiver of the embodiment 11 comprises a plurality of thedesired wave receivers for receiving the CDMA signal as the desiredwaves. By this configuration, a plurality of desired waves can bereceived efficiently with high accuracy.

The shared wave canceller 69 is capable of removing the CDMA signal orthe TD-CDMA signal which interferes or jams up to receive the desiredwave transmitted to the diversity antennas 41 and 42.

The signal obtained by removing the shared wave signal as the outputsignal from the shared wave canceller 69 from the input signaltransmitted to the diversity antennas 41 and 42, that is, the outputsignals from the adders 73 and 74 in the desired wave receiver 99 areinput to the desired wave correlators 91 and 92, 201 and 202, 211 and212 in the desired wave receivers 99, 209, 219. Each of the desired wavecorrelation code generators 93, 203, 213 generates the independentorthogonal code, so that each channel is separated in order to receivethe target desired wave signal. The output signals from the desired wavecorrelators 91 and 92, 201 an 202, 211 and 212 are inputted to thedesired wave equalizers 94 and 95 in the first desired wave receiver 99,the desired wave equalizers 204 and 205 in the second desired wavereceiver 209,..., the desired wave equalizers 214 and 215 in the n-Thdesired wave receiver 219, respectively. Each of the desired waveequalizers in the desired wave receivers 99, 209, and 219 removes theinterference from the correlated signal output from each desired wavecorrelator. The output signals from the desired wave equalizers areadded the adder. The desired wave determinator judges the output signalfrom the adder in order to obtain the target channel signal, so thateach desired wave receiver can receive the desired target channelsignal.

As described above, according to the embodiment 11, because thediversity receiver of the embodiment 11 comprises one shared wavecanceller and a plurality of desired wave receivers, there is the effectthat it can be applied to the case in which the desired wave signals canbe received accurately when the CDMA shared wave has a strong signalpower and this CDMA shared wave can be removed. Furthermore, when thediversity receiver of the embodiment 11 is used as a receiver in a basestation, the shared wave that is the target signal to be removed can beused efficiently as useful channel information.

Embodiment 12

FIGS. 24 and 25 are block diagrams showing a diversity receiveraccording to the twelfth embodiment of the present invention. In thediagrams, 119 designates the shared wave canceller for removing theFDMA/TDMA signal as the shared wave, and 99, 209, 219 each denotes thedesired wave receiver for receiving the CDMA signal as the desired wave.Specifically, the shared wave canceller 119 is same as that used in theembodiment 3, and each of the desired wave receivers 99, 209, and 219 issame as the desired wave receiver used in the embodiment 2, thereforethe explanation of them is omitted here.

The diversity receiver of the embodiment 12 comprises a plurality of thedesired wave receivers for receiving the CDMA signal as the desiredwaves. By this configuration, a plurality of desired waves can bereceived efficiently with high accuracy.

The shared wave canceller 119 is capable of removing the FDMA/TDMAsignal which interferes or jams up to receive the desired wavetransmitted to the diversity antennas 41 and 42.

The signals obtained by removing the shared wave signals, as the outputsignals of the shared wave canceller 69, from the input signalstransmitted to the diversity antennas 41 and 42, that is, the outputsignals from the adders 73 and 74 in the desired wave receiver 99 areinputted to the desired wave correlators 91 and 92, 201 and 202, 211 and212 in the desired wave receivers 99, 209, and 219. Each of the desiredwave correlation code generators 93, 203, 213 generates an independentorthogonal code, so that each channel is separated in order to receivethe target desired wave signal. The output signals from the desired wavecorrelators 91 and 92, 201 and 202, 211 and 212 are inputted to thedesired wave equalizers 94 and 95 in the first desired wave receiver 99,the desired wave equalizers 204 and 205 in the second desired wavereceiver 209, . . . , the desired wave equalizers 214 and 215 in then-Th desired wave receiver 219, respectively. Each of the desired waveequalizers in the desired wave receivers 99, 209, and 219 removes theinterference from the correlated signal output from each desired wavecorrelator. The output signals from the desired wave equalizers areadded to the adder. The desired wave determinator judges the outputsignal from the adder in order to obtain the target channel signal, sothat each desired wave receiver can receive the desired target channelsignal.

As described above, according to the embodiment 12, because thediversity receiver of the embodiment 12 comprises one shared wavecanceller and a plurality of desired wave receivers, there is the effectthat it can be applied to the case in which the desired wave signals canbe received accurately when the FDMA/TDMA shared wave has a strongsignal power and this FDMA/TDMA shared wave can be removed. Furthermore,when the diversity receiver of the embodiment 12 is used as a receiverin a base station, the shared wave that is the target signal to beremoved can be used efficiently as useful channel information.

Embodiment 13

FIGS. 26 and 27 are block diagrams showing a diversity receiveraccording to the thirteenth embodiment of the present invention. In thediagrams, 69 and 229 designate the shared wave cancellers for removingthe CDMA signal or the TD-CDMA signal as the shared wave, and 79 and 189each denotes the desired wave receiver for receiving the FDMA/TDMAsignal as the desired wave. Specifically, each of the shared wavecancellers 69 and 229 is same as that used in the embodiment 1, and eachof the desired wave receivers 79 and 189 is same as the desired wavereceiver used in the embodiment 1, therefore the explanation of them isomitted here. Furthermore, the configuration and the operation of eachof the shared wave cancellers 69 and 229 and the desired wave receivers79 and 189 forming the diversity receiver of the embodiment 13 are sameas those of the embodiment 1 and embodiment 10, therefore, theexplanation of them is omitted here.

The diversity receiver of the embodiment 13 can remove each of theshared wave signals simultaneously by using a plurality of shared wavecancellers when there are a plurality of shared wave channels. Inaddition to this, it can be achieved to increase the function to avoidoccurrences of the system down caused by the failure of the transmissionpower control in the mobile station 1 as the most serious defectincluded in CDMA method, when the diversity receiver of the embodiment13 is applied to a receiver in a base station.

Embodiment 14

FIGS. 28 and 29 are block diagrams showing a diversity receiveraccording to the fourteenth embodiment of the present invention. In thediagrams, 69 and 229 designate the shared wave cancellers for removingthe CDMA signal or the TD-CDMA signal as the shared wave, and 99 and 209denote the desired wave receivers for receiving the CDMA signal or theTD-CDMA signal as the desired wave. Specifically, each of the sharedwave cancellers 69 and 229 is same as that used in the embodiment 1, andeach of the desired wave receivers 99 and 209 is same as the desiredwave receiver used in the embodiment 2, therefore the explanation ofthem is omitted here. Furthermore, the configuration and the operationof each of the shared wave cancellers 69 and 229 and the desired wavereceivers 99 and 209 forming the diversity receiver of the embodiment 14are same as those of the embodiment 1, the embodiment 2, and theembodiment 11, therefore, the explanation of them is omitted here.

The diversity receiver of the embodiment 14 can remove each of theshared wave signals simultaneously by using a plurality of shared wavecancellers when there are a plurality of shared wave channels. Inaddition to this, it can be achieved to increase the function to avoidthe occurrence of a system down caused by the failure of thetransmission power control in the mobile station 1 as the most seriousdefect included in CDMA method, when the diversity receiver of theembodiment 14 is applied to a receiver in a base station.

Embodiment 15

FIGS. 30 and 31 are block diagrams showing a diversity receiveraccording to the fifteenth embodiment of the present invention. In thediagrams, 119 and 249 designate the shared wave cancellers for removingthe FDMA/TDMA signal as the shared wave, and 99 and 209 denote thedesired wave receivers for receiving the CDMA signal or the TD-CDMAsignal as the desired wave. Specifically, each of the shared wavecancellers 119 and 249 is same as that used in the embodiment 3, andeach of the desired wave receivers 99 and 209 is same as the desiredwave receiver used in the embodiment 2, therefore the explanation ofthem is omitted here. Furthermore, the configuration and the operationof each of the shared wave cancellers 119 and 249 and the desired wavereceivers 99 and 209 forming the diversity receiver of the embodiment 15are same as those of the embodiment 2, the embodiment 3, and embodiment12, therefore, the explanation for them is omitted here.

The diversity receiver of the embodiment 15 can remove each of theshared wave signals simultaneously and efficiently by using a pluralityof shared wave cancellers when there are a plurality of shared wavechannels.

Embodiment 16

FIGS. 32 and 33 are block diagrams showing a diversity receiveraccording to the sixteenth embodiment of the present invention. In thediagrams, 119A, 69A, 69B, and 119B designate the shared wave cancellersfor removing the FDMA/TDMA signal, the CDMA signal, the TD-CDMA signalas the shared waves. 189A, 189B, 209A, 209B denote the desired wavereceivers for selecting and outputting the FDMA/TDMA signal, the CDMAsignal, the TD-CDMA signal as the desired waves. These shared wavecancellers and the desired wave receivers are same in configuration andoperation as those used in the diversity receivers of the embodiments 1to 3. The diversity receiver of the embodiment 16 comprises a pluralityof shared wave cancellers and desired wave receivers described above.Therefore the explanation for them is omitted here.

The diversity receiver of the embodiment 16 comprises the plurality ofshared wave cancellers used when a plurality of shared wave channels arethe FDMA/TDMA signal, the CDMA signal, or the TD-CDMA signal. Inaddition to this configuration, it further comprises a plurality ofdesired wave receivers used when a plurality of desired wave channelsare the FDMA/TDMA signal, the CDMA signal, or the TD-CDMA signal.

The output signal from each of the shared wave cancellers 119A, 69A,69B, and 119B is added by each of the adders 251 to 256, subtracts fromthe entire diversity input signal received by the diversity antennas 41and 42 by the adders 73 and 74, and then outputs to each of the desiredwave receivers 189A, 189B, 209A, and 2091B.

As described above, according to the embodiment 16, it is possible toremove a plurality of shared waves simultaneously and to receive aplurality of desired waves with high accuracy by a combination of aplurality of shared wave cancellers and a plurality of shared wavereceivers. Furthermore, it can be achieved to avoid the occurrence ofthe system down in the base station and to use the removed shared waveinformation effectively. Therefore it is possible to provide the radiocommunication system of a high efficiency.

INDUSTRIAL APPLICABILITY

As set forth above, the frequency sharing mobile communication systemcomprising the diversity receiver having the shared wave cancelleraccording to the present invention is suitable to remove shared wavesignals from radio frequency signals and to transform desired wavesignals, and to use shared wave signals when radio signals are receivedthrough diversity antennas in the base stations.

What is claimed is:
 1. A frequency sharing mobile communication systemwhich shares frequency spectrum with other mobile communication systemsusing different multiple access encoding and modulation methods,comprising: at least one base station having a diversity receiverincluding multiple antennas for receiving communication signals fromdifferent transmission signal paths; a shared wave cancellation circuitincluding a plurality of correlators for obtaining shared wave signalsfrom each diversity antenna, a plurality of multi-path equalizers forequalizing respective shared wave signals from said plurality ofcorrelators, a combiner for combining the shared wave signals from saidequalizers to obtain shared wave information, and a plurality ofmulti-path simulators, each for receiving said shared wave informationand simulating the transmission path of the signal received by arespective diversity antenna to produce a simulated transmission pathshared wave signal; said simulated transmission path shared wave signalsbeing sent to a desired wave receiver which receives signals from eachdiversity antenna and subtracts said simulated transmission path sharedwave signals from the signals received by each diversity antenna toobtain a desired wave signal.
 2. The frequency sharing mobilecommunication system of claim 1, wherein said shared wave cancellationcircuit comprises a CDMA shared wave canceller for cancelling CDMAshared wave signals on CDMA signal channels that share frequencies withFDMA/TDMA signals on a frequency axis.
 3. A frequency sharing mobilecommunication system as claimed in claim 2, wherein the CDMA cancellerfor cancelling the CDMA signals sharing with the FDMA/TDMA signals infrequency fields, comprises: CDMA correlators whose number is equal tothe number of a plurality of diversity antennas; a correlation codegenerator for generating CDMA correlation codes and providing them tothe CDMA correlators; transmission path equalizers whose number is equalto the number of the plurality of diversity antennas; an adder foradding outputs from the transmission path equalizers; a determinator forjudging the output from the adder; a modulator for inputting the outputfrom the determinator and for generating and outputting reproduced CDMAsignals; transmission path simulators, whose number is equal to thenumber of the plurality of diversity antennas, for reproducinginterferences in a plurality of transmission paths based on the outputfrom the modulator; and a microprocessor for determining coefficients ofthe transmission path simulators based on equalization coefficients ofthe transmission path equalizers.
 4. A frequency sharing mobilecommunication system as claimed in claim 2, wherein the desired wavereceiver is a FDMA/TDMA desired wave receiver, which comprises: delayelements for delaying each of signals received by the plurality ofdiversity antennas, independently; adders, whose number is equal to thenumber of the plurality of diversity antennas, for removing reproducedCDMA signals, whose number is equal to the number of the plurality ofdiversity antennas, output from the CDMA shared wave cancellers from theoutput of the delay elements by subtraction; desired wave equalizers,whose number is equal to the number of plurality of diversity antennas,for equalizing the output from the adders; a second adder for adding theoutputs from the desired wave equalizers; and a desired wave demodulatorfor outputting a desired wave based on the output from the second adder.5. A frequency sharing mobile communication system as claimed in claim4, comprises a plurality of the FDMA/TDMA desired wave receivers and aplurality of CDMA shared wave cancellers, thereby a plurality of theCDMA signals are removed simultaneously.
 6. A frequency sharing mobilecommunication system as claimed in claim 4, comprises at least one basestation comprising a plurality of the CDMA shared wave cancellers and aplurality of the FDMA/TDMA desired wave receivers.
 7. A frequencysharing mobile communication system as claimed in claim 2, wherein thedesired wave receiver is a CDMA desired wave receiver, which comprises:delay elements for delaying each of signals received by the plurality ofdiversity antennas, independently; adders for removing reproduced CDMAsignals output from the CDMA shared wave cancellers from the output ofthe delay elements by subtraction; CDMA desired wave correlators, whosenumber is equal to the number of the plurality of diversity antennas,for correlating the output from the adders; a correlation mode generatorfor generating CDMA correlation codes and for providing them to the CDMAdesired wave correlators; desired wave equalizers, whose number is equalto the number of the plurality of diversity antennas, for equalizing theoutput from the CDMA desired wave correlators; an adder for adding theoutputs from the desired wave equalizers; and a desired wave demodulatorfor outputting a desired wave based on the output from the adder.
 8. Afrequency sharing mobile communication system as claimed in claim 7,comprises the CDMA desired wave receiver and a plurality of the CDMAshared wave cancellers, thereby a plurality of the CDMA signals areremoved simultaneously.
 9. A frequency sharing mobile communicationsystem as claimed in claim 7, comprises at least one base stationcomprising a plurality of the CDMA shared wave cancellers and aplurality of the CDMA desired wave receivers.
 10. The frequency sharingmobile communication system of claim 1, wherein said shared wavecancellation circuit comprises a TD-CDMA shared wave canceller forcancelling TD-CDMA shared wave signals that share frequencies withFDMA/TDMA signals on a frequency axis.
 11. A frequency sharing mobilecommunication system as claimed in claim 10, wherein the TD-CDMAcanceller for cancelling the TD-CDMA signals sharing with the FDMA/TDMAsignals in frequency fields, which comprises: TD-CDMA correlators whosenumber is equal to the number of a plurality of diversity antennas; acorrelation code generator for generating TD-CDMA correlation codes andproviding them to the TD-CDMA correlators; transmission path equalizerswhose number is equal to the number of the plurality of diversityantennas; an adder for adding outputs from the transmission pathequalizers; a determinator for judging the output from the adder; amodulator for generating and outputting reproduced TD-CDMA signals basedon the output from the determinater; transmission path simulators, whosenumber is equal to the number of the plurality of diversity antennas,for reproducing interferences in a plurality of transmission paths basedon the output from the modulator; and a microprocessor for determiningcoefficients of the transmission path simulators based on equalizationcoefficients of the transmission path equalizers.
 12. A frequencysharing mobile communication system as claimed in claim 10, wherein thedesired wave receiver is a FDMA/TDMA desired wave receiver, whichcomprises: delay elements for delaying each of signals received by theplurality of diversity antennas, independently: adders, whose number isequal to the number of the plurality of diversity antennas, for removingreproduced TD-CDMA signals output from the TD-CDMA shared wavecancellers from the output of the delay elements by subtraction; desiredwave equalizers, whose number is equal to the number of the plurality ofdiversity antennas, for equalizing the output from the adders; a secondadder for adding the outputs from the desired wave equalizers; and adesired wave demodulator for outputting a desired wave based on theoutput from the second adder.
 13. A frequency sharing mobilecommunication system as claimed in claim 10, wherein the desired wavereceiver is a TD-CDMA desired wave receiver, which comprises: delayelements for delaying each of signals received by the plurality ofdiversity antennas, independently; adders for removing reproducedTD-CDMA signals output from the TD-CDMA shared wave cancellers from theoutput from the delay elements by subtraction; TD-CDMA desired wavecorrelators, whose number is equal to the number of the plurality ofdiversity antennas, for correlating the output from the adders; acorrelation code generator for generating TD-CDMA correlation codes andfor providing them to the TD-CDMA desired wave correlators; desired waveequalizers, whose number is equal to the number of the plurality ofdiversity antennas, for equalizing the output from the TD-CDMA desiredwave correlators; an adder for adding the outputs from the desired waveequalizers; and a desired wave demodulator for outputting a desired wavebased on the output from the adder.
 14. A frequency sharing mobilecommunication system as claimed in claim 10, wherein the desired wavereceiver is a CDMA desired wave receiver, which comprises: delayelements for delaying each of signals received by the plurality ofdiversity antennas, independently; adders for removing reproducedTD-CDMA signals output from the TD-CDMA shared wave cancellers from theoutput of the delay elements by subtraction; CDMA desired wavecorrelators, whose number is equal to the number of the plurality ofdiversity antennas, for correlating the output from the adders; acorrelation code generator for generating CDMA correlation codes and forproviding them to the CDMA desired wave correlators; desired waveequalizers, whose number is equal to the number of the plurality ofdiversity antennas, for equalizing the output from the CDMA desired wavecorrelators; an adder for adding the outputs from the desired waveequalizers; and a desired wave demodulator for outputting a desired wavebased on the output from the adder.
 15. A frequency sharing mobilecommunication system as claimed in claim 10, wherein the desired wavereceiver is a TD-CDMA desired wave receiver, which comprises: delayelements for delaying each of signals received by the plurality ofdiversity antennas, independently; adders for removing reproduced CDMAsignals output from the CDMA shared wave cancellers from the output fromthe delay elements by subtraction in order to cancel the CDMA signalsthat share in the frequency field on the frequency axis with theFDMA/1-DMA signals; TD-CDMA desired wave correlators, whose number isequal to the number of the plurality of diversity antennas, forcorrelating the output from the adders; a correlation code generator forgenerating TD-CDMA correlation codes and for providing them to theTD-CDMA desired wave correlators; desired wave equalizers, whose numberis equal to the number of the plurality of diversity antennas, forequalizing the output from the TD-CDMA desired wave correlators; anadder for adding the outputs from the desired wave equalizers; and adesired wave demodulator for outputting a desired wave based on theoutput from the adder.
 16. A frequency sharing mobile communicationsystem which shares frequency spectrum with other mobile communicationsystems using different multiple access encoding and modulation methods,comprising: at least one base station having a diversity receiverincluding multiple antennas for receiving communication signals fromdifferent transmission signal paths; a shared wave cancellation circuitcomprising a FDMA/TDMA shared wave canceller for cancelling shared wavesignals on FDMA/TDMA signal channels that share frequencies with CDMAsignals on a frequency axis or with TD-CDMA signals in a time slot, saidcancellation circuit including a plurality of multi-path equalizers forequalizing respective shared wave signals received from respective onesof said multiple antennas, a combiner for combining the shared wavesignals from said equalizers to obtain shared wave information, and aplurality of multi-path simulators, each for receiving said shared waveinformation and simulating the transmission path of the signal receivedby a respective diversity antenna to produce a simulated transmissionpath shared wave signal; said simulated transmission path shared wavesignals being sent to a desired wave receiver which receives signalsfrom each diversity antenna and subtracts said simulated transmissionpath shared wave signals from the signals received by each diversityantenna to obtain a desired wave signal.
 17. A frequency sharing mobilecommunication system as claimed in claim 16, wherein the FDMA/TDMAshared wave canceller comprises: transmission path equalizers whosenumber is equal to the number of the plurality of diversity antennas; anadder for adding outputs from the transmission path equalizers; adeterminator for judging the output from the adder; a modulator forinputting the output from the determinator and for generating andoutputting reproduced FDMA/TDMA signals; transmission path simulators,whose number is equal to the number of the plurality of diversityantennas, for reproducing interferences in the transmission path basedon the output from the modulator; and a microprocessor for determiningcoefficients of the transmission path simulators based on equalizationcoefficients of the transmission path equalizers.
 18. A frequencysharing mobile communication system as claimed in claim 16, wherein thedesired wave receiver is a CDMA desired wave receiver, which comprises:delay elements, whose number is equal to the number of a plurality ofdiversity antennas, for delaying each of signals received by theplurality of diversity antennas, independently; adders, whose number isequal to the number of the plurality of diversity antennas, for removingreproduced FDMA/TDMA signals output from the FDMA/TDMA shared wavecancellers from the output of the delay elements by subtraction; CDMAdesired wave correlators, whose number is equal to the number of theplurality of diversity antennas, for correlating the output from theadders; a correlation code generator for generating CDMA correlationcodes and for providing them to the CDMA desired wave correlators;desired wave equalizers, whose number is equal to the number of theplurality of diversity antennas, for equalizing the output from the CDMAdesired wave correlators; an adder for adding the outputs from thedesired wave equalizers; and a desired wave demodulator for outputting adesired wave based on the output from the adder.
 19. A frequency sharingmobile communication system as claimed in claim 16, wherein the desiredwave receiver is a TD-CDMA desired wave receiver, which comprises: delayelements for delaying each of signals received by the plurality ofdiversity antennas, independently; adders, whose number is equal to thenumber of the plurality of diversity antennas, for removing reproducedFDMA/TDMA signals output from the FDMA/TDMA shared wave cancellers fromTD-CDMA signals designated by a time slot that being equal to the timeslot of the shared waves output from the delay elements; TD-CDMA desiredwave correlators, whose number is equal to the number of the pluralityof diversity antennas, for correlating the output having no shared wavesignals provided from the adders; a correlation code generator forgenerating TD-CDMA correlation codes and for providing them to theTD-CDMA desired wave correlators; desired wave equalizers, whose numberis equal to the number of the plurality of diversity antennas, forequalizing the output from the TD-CDMA desired wave correlators; anadder for adding the outputs from the desired wave equalizers; and adesired wave demodulator for outputting a desired wave based on theoutput from the adder.
 20. A frequency sharing mobile communicationsystem as claimed in claim 16, which comprises a plurality of theFDMA/TDMA shared wave cancellers and a plurality of the CDMA or TD-CDMAdesired wave receivers, thereby, a plurality of the FDMA/TDMA sharedwave signals are removed simultaneously.
 21. A frequency sharing mobilecommunication system having at least one base station comprising: aplurality of CDMA shared wave cancellers for canceling shared waves onchannels of CDMA signals that share frequencies with FDMA/TDMA signalson a frequency axis; a plurality of TD-CDMA shared wave cancellers forcanceling TD-CDMA signals that share frequencies with said FDMA/TDMAsignals; a plurality of FDMA/TDMA shared wave cancellers for cancelingshared waves on FDMA/TDMA signal channels that share frequencies withCDMA signals on a frequency axis or share frequencies with TD-CDMAsignals in a same time slot; a plurality of desired FDMA/TDMA wavereceivers comprising: delay elements for delaying each of signalsreceived by a plurality of diversity antennas, independently; aplurality of adders, whose number is equal to the number of theplurality of diversity antennas, for removing reproduced CDMA signals,whose number is equal to the number of the plurality of diversityantennas, outputted by the CDMA shared wave cancellers from the outputof the delay elements by subtraction; a plurality of desired waveequalizers, whose number is equal to the number of the plurality ofdiversity antennas, for equalizing the output from the adders; a secondadder for adding the outputs from the desired wave equalizers; and adesired wave demodulator for outputting a desired wave based on theoutput from the second adder; a plurality of CDMA desired wavereceivers, which comprises: a plurality of delay elements for delayingeach of signals received by the plurality of diversity antennas,independently; a plurality of adders for removing reproduced CDMAsignals outputted from the CDMA shared wave cancellers from the outputof the delay elements by subtraction; a plurality of CDMA desired wavecorrelators, whose number is equal to the number of the plurality ofdiversity antennas, for correlating the output from the adders; acorrelation code generator for generating CDMA correlation codes and forproviding them to the CDMA desired wave correlators; a plurality ofdesired wave equalizers, whose number is equal to the number of theplurality of diversity antennas, for equalizing the output from the CDMAdesired wave correlators; an adder for adding the outputs from thedesired wave equalizers; and a desired wave demodulator for outputting adesired wave based on the output from the adder; and a plurality ofTD-CDMA desired wave receivers, which comprises: a plurality of delayelements for delaying each of signals received by the plurality ofdiversity antennas, independently; a plurality of adders for removingreproduced TD-CDMA signals output from the TD-CDMA shared wavecancellers from the output from the delay elements by subtraction; aplurality of TD-CDMA desired wave correlators, whose number is equal tothe number of the plurality of diversity antennas, for correlating theoutput from the adders; a correlation code generator for generatingTD-CDMA correlation codes and for providing them to the TD-CDMA desiredwave correlators; a plurality of desired wave equalizers, whose numberis equal to the number of the plurality of diversity antennas, forequalizing the output from the TD-CDMA desired wave correlators; anadder for adding the outputs from the desired wave equalizers; and adesired wave demodulator for outputting a desired wave based on theoutput from the adder.